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FIGURE 4
THERMOSTAT CONNECTIONS (TB1)
1/4” QUICK CONNECT TERMINALS
RS-BUS LINK (TB82, future use)
I+ = DATA HIGH CONNECTION
I - = DATA LOW CONNECTION
RS-BUS OUTDOOR (TB83)
R = 24VAC
I + = DATA HIGH CONNECTION
I - = DATA LOW CONNECTION
C = 24VAXC COMMON
RS-BUS INDOOR (TB84)
R = 24VAC
I + = DATA HIGH CONNECTION
I - = DATA LOW CONNECTION
C = 24VAXC COMMON
+
FLAME
SENSE
COMBUSTION
AIR INDUCER
CONNECTOR
DIP SWITCHES
OUTDOOR AIR
SENSOR
TERMINALS
DISCHARGE AIR
SENSOR
TERMINALS
W915
W951
W914
ON-BOARD
LINKS
INDOOR
BLOWER
CONNECTOR
EAC
HUM
LINE VOLTAGE
TERMINALS
NEUTRAL
TERMINALS
IGNITOR
CONNECTOR
7-SEGMENT
DIAGNOSTIC LED
DIAGNOSTIC
PUSH BUTTON
FACTORY TEST
HEADER PINS.
FACTORY USE ONLY.
TB83 OUTDOOR
TB84 INDOOR
DS = DEHUMIDIFICATION SIGNAL
W2 = HEAT DEMAND FROM 2ND STAGE T/STAT
W1 = HEAT DEMAND FROM 1ST STAGE T/STAT
R = CLASS 2 VOLTAGE TO THERMOSTAT
G = MANUAL FAN FROM T'STAT
C = THERMOSTAT SIGNAL GROUND CONNECTED TO
TRANSFORMER GRD (TR) & CHASIS GROUND (GRD)
Y1 = THERMOSTAT 1ST STAGE COOL SIGNAL
Y2 = THERMOSTAT 2ND STAGE COOL SIGNAL
O = THERMOSTAT SIGNAL TO HEAT PUMP
REVERSING VALVE
H = 24V HUMIDIFIER OUTPUT. DO NOT CONNECT TO COM
FORTSENSE
®
THERMOSTAT
L = USE ONLY WITH A COMMUNICATING THERMOSTAT AND
A NON-COMMUNICATING OUTDOOR UNIT
DH = DEHUMIDIFICATION OUTPUT
COMMUNICATING THERMOSTAT ONLY
HUM = 120 VAC OUTPUT TO HUMIDIFIER
XMFR = 120 VAC OUTPUT TO TRANSFORMER
LI = 120 VAC INPUT TO CONTROL
CIRC = 120 VAC OUTPUT TO CIRCULATING BLOWER
EAC = 120 VAC OUTPUT TO ELECTRICAL AIR CLEANER
NEUTRALS = 120 VAC NEUTRAL
L - use only with
communicating T'stat and
non-communicating outdoor
unit.
W915 Y1 TO Y2
W951 R TO O
W914 R TO DS
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